FIELD: power engineering; piston internal combustion engines. SUBSTANCE: internal combustion engine has cylinders arranged in circle around common middle drive shaft. Each cylinder has two pistons installed for movement towards each other and from each other and common working chamber for each pair of cylinders. Each piston has its connecting rod which is installed for longitudinal displacement. Free outer end of connecting rod rests through support roller on its cam guide having curvilinear, i. e. sinusoidal curvilinear shape and arranged on each opposite end of cylinder to control travel of piston relative to cylinder operating with piston. At least one of cam guides in each cylinder is installed for longitudinal displacement in cylinder. EFFECT: provision of compression ratio control. 6 cl, 2 dwg, 29 dwg
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